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Thermo-Mechanically Coupled Thermo-Elasto-Visco-Plastic Modeling of Thermo-Induced Shape Memory Polyurethane at Finite Deformation

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Acta Mechanica Solida Sinica 2018年第2期31卷 141-160页

作者： Jian Li Qian-hua Kan Ze-bin Zhang Guo-zheng Kang wenyi yan State Key Laboratory of Traction Power Southwest Jiaotong University Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong University Department of Mechanical and Aerospace Engineering Monash University

A series of monotonic tensile experiments of thermo-induced shape memory polyurethane （TSMPU） at different loading rates were carried out to investigate the interaction between the internal heat production and the mechanical deformation. It is shown that the tem- perature variation on the surfaces of the specimens due to the internal heat production affects the mechanical properties of TSMPU remarkably. Then, based on irreversible thermodynamics, the Helmholtz free energy was decomposed into three parts, i.e., the instantaneous elastic free energy, visco-plastic free energy and heat free energy. The total deformation gradient was decomposed into the mechanical and thermal parts, and the mechanical deformation gradient was further divided into the elastic and visco-plastic components. The Hencky＇s logarithmic strain was used in the current configuration. The heat equilibrium equation of internal heat production and heat exchange was derived in accordance with the first and second thermodynamics laws. The temperature of specimens was contributed by the internal heat production and the ambient temperature simultaneously, and a thermo-mechanically coupled thermo-elasto-visco-plastie model was established. The effect of temperature variation of specimens on the mechanical properties of the material was considered in this work. Finally, the capability of the proposed model was validated by comparing the simulated results with the corresponding experimental data of TSMPU.

关键词： Shape memory polyurethane Thermo-mechanical coupling Rate dependence Internal heat production Finite deformation

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Analyzing topics in social media for improving digital twinning based product development

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Digital Communications and Networks 2024年第2期10卷 273-281页

作者： wenyi Tang Ling Tian Xu Zheng Ke yan School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China

Digital twinning enables manufacturers to create digital representations of physical entities,thus implementing virtual simulations for product *** efforts of digital twinning neglect the decisive consumer feedback in product development stages,failing to cover the gap between physical and digital *** work mines real-world consumer feedbacks through social media topics,which is significant to product *** specifically analyze the prevalent time of a product topic,giving an insight into both consumer attention and the widely-discussed time of a *** primary body of current studies regards the prevalent time prediction as an accompanying task or assumes the existence of a preset ***,these proposed solutions are either biased in focused objectives and underlying patterns or weak in the capability of generalization towards diverse *** this end,this work combines deep learning and survival analysis to predict the prevalent time of *** propose a specialized deep survival model which consists of two *** first module enriches input covariates by incorporating latent features of the time-varying text,and the second module fully captures the temporal pattern of a rumor by a recurrent network ***,a specific loss function different from regular survival models is proposed to achieve a more reasonable *** experiments on real-world datasets demonstrate that our model significantly outperforms the state-of-the-art methods.

关键词： Digital twinning Product development Topic analysis Social media

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Characterization and mapping of a novel mutant sms1 (senescence and male sterility 1) in rice

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Journal of Genetics and Genomics 2010年第1期37卷 47-55页

作者： wenyi yan Shenghai Ye Qingsheng Jin Longjun Zeng Yu Peng Dawei yan Weibing yang Donglei yang Zuhua He yanjun Dong Xiaoming Zhang College of Life and Environment Sciences Shanghai Normal UniversityShanghai 200234China Institute of Crop and Nuclear Technology Utilization Zhejiang Academy of Agricultural SciencesHangzhou 310021China Institute of Plant Physiology & Ecology Shanghai Institutes for Biological Sciences Chinese Academy of SciencesShanghai 200032China

Plant senescence plays diverse important roles in development and environmental ***,the molecular basis of plant senescence is remained largely unknown.A rice spontaneous mutant with the character of early senescence and male sterility （sms） was found in the breeding line *** order to identify the gene SMS1 and the underlying mechanism,we preliminarily analyzed physiological and biochemical phenotypes of the *** mutant contained lower chlorophyll content compared with the wild type control and was severe male sterile with lower pollen *** analysis showed that the mutant was controlled by a single recessive *** the map-based cloning approach,we fine-mapped SMS1 to a 67 kb region between the markers Z3-4 and Z1-1 on chromosome 8 using 1,074 F2 recessive plants derived from the cross between the mutant sms1 （japonica） × Zhenshan 97 （indica）,where no known gene involved in senescence or male sterility has been *** the SMS1 gene will be a novel gene that regulates the two developmental *** further cloning and functional analysis of the SMS1 gene is under way.

关键词： senescence male sterility rice molecular marker gene mapping

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Emission characteristics of dioxins,furans and polycyclic aromatic hydrocarbons during fluidized-bed combustion of sewage sludge

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Journal of Environmental Sciences 2009年第12期21卷 1747-1752页

作者： DENG wenyi, yan Jianhua, LI Xiaodong, WANG Fei, CHI Yong, LU ShengyongState Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China. State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

Pre-dried sewage sludge with high sulfur content was combusted in an electrically heated lab-scale fluidized-bed incinerator. The emission characteristics of polychlorinated dibenzo-p-dioxins （PCDDs）, polychlorinated dibenzofurans （PCDFs） and polycyclic aromatic hydrocarbons （PAHs） were studied. Coal and calcium oxide （CaO） were added during the sewage sludge combustion tests to optimize combustion conditions and control SO2 emission. The results indicated that the flue gases emitted during mono-combustion of sewage sludge were characterized by relatively high concentrations of SO2, NOx and organic pollutants, due to the high sulfur, nitrogen, and volatile matter content of sewage sludge. The total 16 USEPA priority PAHs and 2,3,7,8-substituted PCDD/Fs produced from sewage sludge combustion were found to be 106.14 μg/m^3 and 8955.93 pg/m^3 in the flue gas, respectively. In the case of cocombustion with coal （msludge/mcoal =1：1）, the 16 PAHs and 2,3,7,8-substituted PCDD/Fs concentrations were markedly lower than those found during mono-combustion of sewage sludge. During co-combustion, a suppressant effect of CaO on PCDD/Fs formation was observed.

关键词： co-combustion PCDD/Fs polycyclic aromatic hydrocarbons (PAHs) sewage sludge

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A Hierarchical Method for Locating the Interferometric Fringes of Celestial Sources in the Visibility Data

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Research in Astronomy and Astrophysics 2024年第3期24卷 110-128页

作者： Rong Ma Ruiqing yan Hanshuai Cui Xiaochun Cheng Jixia Li Fengquan Wu Zongyao Yin Hao Wang wenyi Zeng Xianchuan Yu School of Artificial Intelligence Beijing Normal UniversityBeijing 100875China Department of Computer Science Swansea UniversitySwanseaSA18ENUK National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

In source detection in the Tianlai project,locating the interferometric fringe in visibility data accurately will influence downstream tasks drastically,such as physical parameter estimation and weak source *** that traditional locating methods are time-consuming and supervised methods require a great quantity of expensive labeled data,in this paper,we first investigate characteristics of interferometric fringes in the simulation and real scenario separately,and integrate an almost parameter-free unsupervised clustering method and seeding filling or eraser algorithm to propose a hierarchical plug and play method to improve location ***,we apply our method to locate single and multiple sources’interferometric fringes in simulation ***,we apply our method to real data taken from the Tianlai radio telescope ***,we compare with unsupervised methods that are state of the *** results show that our method has robustness in different scenarios and can improve location measurement accuracy effectively.

关键词： methods data analysis-techniques image processing-techniques interferometric

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The Accuracy in Prediction of Elastic Modulus of Elasto-plastic Materials by Spherical Indentation

The Accuracy in Prediction of Elastic Modulus of Elasto-plas...

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2012年海峡两岸破坏科学/材料试验学术会议

作者： Qianhua Kan Guozheng Kang wenyi yan Han Jiang Yujie Liu School of Mechanics and Engineering Southwest Jiaotong University Department of Mechanical and Aerospace Engineering Monash University School of Mechanics and Engineering Southwest Jiaotong Universit

Micro- or nano-indentation tests are commonly applied to determine mechanical properties of elastic-plastic materials at small *** indenters have been popularly applied to numerically investigate indentation technique in order to avoid plastic *** accuracy of the prediction of the elastic modulus by using the popular Field-Swain and Oliver-Pharr method for spherical indentation was investigated *** show that both methods exhibit significant depth-sensitive error in predicted elastic modulus of elastic-plastic materials due to the non-geometrical similarity of spherical indenter and pile-up ***,the advantages of both Field-Swain and Oliver-Pharr methods were combined to improve the accuracy in prediction of elastic ***,the modified method was numerically and experimentally validated.

关键词： Spherical Indentation Pile-up Sink-in Elastic Modulus Finite Element Analysis

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rADSC-loaded tubular units composed of multilayer electrospun membranes promoted bone regeneration of critical-sized skull defects

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Materials Futures 2024年第3期3卷 178-194页

作者： Huamin Jiang Zhaoyi Lin Jinze Li Ting Song Hongyun Zang Pengwen Li Jiarun Li wenyi Hou Jianhua Zhou yan Li School of Biomedical Engineering Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107People’s Republic of China Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument Sun Yat-sen UniversityGuangzhou 510006People’s Republic of China Hospital of Stomatology Guangdong Provincial Key Laboratory of StomatologyInstitute of Stomatological ResearchGuanghua School of StomatologySun Yat-sen UniversityGuangzhou 510062People’s Republic of China The Third Affiliated Hospital of Sun Yat-sen University Guangzhou 510630People’s Republic of China

Adipose-derived stem cells(ADSCs)have considerable potential for bone ***,their performance is limited by a lack of scaffolds that adequately mimic the hierarchical structure of bone to promote proliferation and osteogenic differentiation of *** this study,nanofiber membranes composed of polycaprolactone,poly(lactide-co-glycolide),and hydroxyapatite(HAp)were prepared via electrospinning,and the membranes curled after responding to temperature stimuli in an aqueous *** electron microscopy and scanning electron microscopy observations indicated that needle-like HAp nanoparticles with an average diameter of 57±39 nm and a length–diameter ratio of 7.4±1.56 were entrapped in the nanofiber matrix and did not affect the surface morphology of *** cutting and deformation,the nanofibers changed from straight to bent,and the diameters increased;they were 1105±200 nm for BPLG85-H and 1120±199 nm for ***,tubular units with a single layer(BPLG-H(1.5))or multiple layers(BPLG-H(3.5))were obtained by controlling the initial shape and size of the *** on the concave surface of BPLG-H(3.5)proliferated faster and exhibited better osteogenic activity than those on the convex side of BPLG-H(3.5)and both surfaces of BPLG-H(1.5),which was correlated with the higher expressions of vascular endothelial growth factor and bone morphogenetic protein ***,rADSCs on both units maintained osteogenic activity after storage at-80◦C for 20 *** rat skull defect(diameter of 8 mm)models,rADSC-loaded BPLG-H(3.5)units fixed using gelatin hydrogel(ADSC@BHM)exhibited 84.1±6.6%BV/TV after implantation for 12 weeks,which was 155.6%higher than that of the Blank group.H&E and Masson’s staining results demonstrated that there was more bone regeneration at the defect center of ADSC@BHM than in the BHM and Blank *** conclusion,rADSC-loaded BPLG-H(3.5)with an osteon-mimic structure provides a potential strategy to repair

关键词： adipose-derived stem cells electrospinning composite fiber bone regeneration

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民国旗袍的文化耦合及时尚设计

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丝绸 2022年第5期59卷 120-127页

作者：颜文溢许旭兵东华大学服装与艺术设计学院上海200051 东华大学现代服装设计与技术教育部重点实验室上海200051 东华大学上海市纺织智能制造与工程“一带一路”国际联合实验室上海200051

旗袍作为民国时期代表性女装形式,曾引领了当时的时代审美风尚,主要价体现在传统服饰造物理念的主体上对外来审美文化的参考吸收,是传统与流行、东方与西方文化耦合下的产物。文章立足于传世实物和文献资料,针对民国旗袍的中华民族个性... 详细信息

旗袍作为民国时期代表性女装形式,曾引领了当时的时代审美风尚,主要价体现在传统服饰造物理念的主体上对外来审美文化的参考吸收,是传统与流行、东方与西方文化耦合下的产物。文章立足于传世实物和文献资料,针对民国旗袍的中华民族个性特征及演变形式,从艺术、文化的角度探究旗袍在民国时期文化耦合背景下呈现的设计思想与审美表达,印证民国旗袍内在蕴含的东西方文化交流与思想变革。总结出民国旗袍对多元文化的包容性和其形制艺术特点,结合当今服装设计通过造型、细节、纹样的变化进行创新设计探索,为新时代中华服饰文化承扬及华服创新设计提供借鉴。

关键词：民国时期旗袍历史流变文化耦合服饰时尚创新设计

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Isobavachromene ameliorates insulin resistance via inactivating the MAPK/NF-κB signaling pathway

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Food Science and Human Wellness 2024年

作者： Zhenhua Liu Zhenhua Liang Lanting Xu Jiajia Yuan Yiqi Li wenyi Kang yan Zhang Bin Cong National R & D Center for Edible Fungus Processing Technology， Henan University Joint International Research Laboratory of Food & Medicine Resource Function College of Agriculture， Henan University Shenzhen Research Institute of Henan University Hebei Key Laboratory of Forensic Medicine， College of Forensic Medicine， Hebei Medical University Hebei Food Safety Key Laboratory， Hebei Food Inspection and Research Institute

Inflammation caused by obesity， particularly in adipose tissue and the liver， can lead to insulin resistance (IR) and trigger type 2 diabetes (T2DM). It is crucial to identify therapeutic agents that alleviate IR by reducing inflammation. Here， we report that isobavachromene (IB)， a flavonoid derived from Psoralea corylifolia Linn.， ameliorates IR in 3T3-L1 adipocytes by inhibiting the MAPK/NF-κB signaling pathway. We first found that IB could promote glucose uptake in 3T3-L1 adipocytes by activating the PI-3K/Akt signaling pathway and was more effective than the positive control sodium orthovanadate at concentrations ranging from 25 to 100 μmol/L. Additionally， IB inhibited RAW264.7 macrophage infiltration into 3T3-L1 adipocytes and suppressed the secretion of inflammatory factors from RAW264.7 macrophages， as well as the phosphorylation levels of key proteins (NF-κB P65， ERK1/2， JNK， and P38) in the NF-κB and MAPK signaling pathways. In summary， IB improves glucose uptake in IR adipocytes， activates the PI-3K/Akt signaling pathway， inhibits the JNK and NF-κB inflammatory signaling pathways， and reduces adipocyte inflammation， thereby improving of IR in 3T3-L1 adipocytes.

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澳大利亚学校价值观教育的特点及其实现途径

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外国教育研究 2014年第4期41卷 122-128页

作者：杨茂庆严文宜广西师范大学教育科学学院广西桂林541004

作为一个多元文化国家,澳大利亚非常重视学校价值观教育,在价值观教育萌芽、探索和确立的过程中出台了一系列政策文件,以使其符合时代发展的要求,满足国家教育发展的需要。其学校价值观教育的主要特点是:培养学生的多元文化思维;注重学... 详细信息

作为一个多元文化国家,澳大利亚非常重视学校价值观教育,在价值观教育萌芽、探索和确立的过程中出台了一系列政策文件,以使其符合时代发展的要求,满足国家教育发展的需要。其学校价值观教育的主要特点是:培养学生的多元文化思维;注重学生的本体发展;强调学生与社会的和谐关系。基于方法引导的价值观课程开发,基于校本文化的价值观教育,基于社会团体活动的价值观教育等是其基本实现途径。

关键词：澳大利亚学校价值观教育实现途径

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